// Copyright 2018 StreamSets Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package lib

import "net"

func GetFreePort() (port int, err error) {
	ln, err := net.Listen("tcp", "[::]:0")
	if err != nil {
		return 0, err
	}
	port = ln.Addr().(*net.TCPAddr).Port
	err = ln.Close()
	return
}
